Abstract: This specification and the resources and research attach hereto provide the basis for a low cost high efficiency low emissive flex duct for air distribution especially where it pertains to the HVAC trade in buildings. The reflective radiant material used in this invention is already certified by energy star for current applications and increases the energy efficiency of a structure as well as the health of those persons or beings dwelling, residing, or working with in said structure. The manufacturing process is also efficient in that manufacturers of current/preexisting duct can use the same machines and processes with only a change of material.